{"schemaVersion":3,"id":"CVE-2020-11931","aliases":["UBUNTU-CVE-2020-11931","USN-4355-1"],"status":"published","duplicateOf":null,"title":null,"description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","dates":{"published":"2020-05-15T03:25:11.587Z","modified":"2024-09-17T00:41:25.129Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":3.3,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":4.6,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":2.1,"severity":"low","vector":"AV:L/AC:L/Au:N/C:P/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0033,"percentile":0.24689,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.0033},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0033,"percentile":0.24689}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0033,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0033,"percentile":0.24689}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-284","name":"Improper Access Control","description":"The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.","type":"weakness","status":"Incomplete","abstraction":"Pillar","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/284.html"},{"id":"CWE-668","name":"Exposure of Resource to Wrong Sphere","description":"The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/668.html"}],"affected":[{"vendor":"canonical","product":"pulseaudio","name":"PulseAudio","label":"pulseaudio","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1:8.0, < 1:8.0-0ubuntu3.12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 1:11.1, < 1:11.1-1ubuntu7.7","noFixRecorded":false,"fixedIn":null},{"text":"≥ 1:13.0, < 1:13.0-1ubuntu1.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 1:13.99.1, < 1:13.99.1-1ubuntu3.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1:8.0, < 1:8.0-0ubuntu3.12 | ≥ 1:11.1, < 1:11.1-1ubuntu7.7 | ≥ 1:13.0, < 1:13.0-1ubuntu1.2 | ≥ 1:13.99.1, < 1:13.99.1-1ubuntu3.2","eol":null,"hubHref":"/vendor/canonical/pulseaudio"},{"vendor":"canonical","product":"ubuntu_linux","name":"ubuntu linux","label":"ubuntu_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"16.04","noFixRecorded":false,"fixedIn":null},{"text":"18.04","noFixRecorded":false,"fixedIn":null},{"text":"19.10","noFixRecorded":false,"fixedIn":null},{"text":"20.04","noFixRecorded":false,"fixedIn":null}],"versionsText":"16.04 | 18.04 | 19.10 | 20.04","eol":{"isEol":true,"eolDate":"2021-04-02T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"16.04","label":"16.04 'Xenial Xerus' (LTS)","eolFrom":"2021-04-02T00:00:00.000Z","isLts":true,"isMaintained":false,"latestVersion":"16.04.7"},"product":{"name":"ubuntu","label":"Ubuntu","category":"os"}},"hubHref":"/vendor/canonical/ubuntu_linux"},{"vendor":"ubuntu","product":"pulseaudio","name":"pulseaudio","label":"pulseaudio","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/pulseaudio","purlType":"deb","versions":[{"text":"< 1:8.0-0ubuntu3.12","noFixRecorded":false,"fixedIn":null},{"text":"< 1:11.1-1ubuntu7.7","noFixRecorded":false,"fixedIn":null},{"text":"< 1:13.99.1-1ubuntu3.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:8.0-0ubuntu3.12 | < 1:11.1-1ubuntu7.7 | < 1:13.99.1-1ubuntu3.2","eol":null,"hubHref":null},{"vendor":"pulseaudio","product":"pulseaudio","name":"pulseaudio","label":"pulseaudio","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 1.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.8.0","eol":null,"hubHref":"/vendor/pulseaudio/pulseaudio"}],"affectedCount":4,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3","label":"forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3","hostname":"forum.snapcraft.io","tags":["X Refsource MISC","REPORT","Third Party Advisory"]},{"url":"https://usn.ubuntu.com/4355-1/","label":"usn.ubuntu.com/4355-1/","hostname":"usn.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-11931","label":"ubuntu.com/security/CVE-2020-11931","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4355-1","label":"ubuntu.com/security/notices/USN-4355-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-11931","label":"www.cve.org/CVERecord?id=CVE-2020-11931","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://launchpad.net/bugs/1877102","label":"launchpad.net/bugs/1877102","hostname":"launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-05-15T03:25:11.587Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-09-17T00:41:25.129Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":13,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T13:57:08.473Z","stale":false,"partial":false}}